1)a kitten of mass 0.06 kg leaps at 30 to the horizontal out of a toy truck of mass 1.2 kg causing it to move over horizontal ground at 4m/s.At what speed did the kitten leap?

The answer is 9.2m/s(but i don't know how to work out)

2)A particle of mass 5m moving with speed v explodes and splits into two pieves with masses of 2m and 3m.The lighter piece continues to move in the original directin with speed 5v relative to the heavier piece.What us the actual speed of the lighter piece?